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6 Setup with the integrated display and adjustment unit
SU 600 Ex • 4 … 20 mA signal conditioning instrument
30653-EN-150129
The characteristics of the current output can be switched over from
4 … 20 mA to 0 … 20 mA.
→
Now select position [
8
] on the function switch, adjust the re-
quested characteristics curve and save your settings
To check if the settings ofSU 600 Ex are correct, the simulation mode
can be used. Any individual measured value can be simulated and
e.g. the correct behaviour of the relays and the connected instruments
can be checked.
Switching over between the functions "
OPERATE
" and "
Simulation
" is
done by pushing the [
+/-
] keys for at least 3 seconds. In the simula-
tion mode, the set value flashes on the display. The simulation can be
switched off by pushing both keys again for approx. 3 seconds. If no
key is pushed, the display switches automatically over to "
OPERATE
"
after approx. 60 minutes and the simulation is terminated.
→
To start simulation, push the [
+/-
] keys simultaneously until the
displayed value starts flashing (approx. 3 seconds). By pushing
either of the [
+/-
] keys, you can set the requested simulation
value and carry out your check.
With a reset, all values set by the user will be lost and are reset to
factory settings.
→
Interrupt the power supply of SU 600 Ex. Push the [
+/-
] keys
simultaneously and hold them while you switch on the power
supply. The display shows "
RES
" and the default settings will be
restored. These are the following:
•
Relay switch on points: 10 %
•
Relay switch off points: 100 %
•
Decimal point: 888.8
•
Display min.: 0
•
Display max.: 100.0
•
Integration time: 0 s
•
Offset correction: 0
•
Current output: 4 … 20 mA
•
Min. adjustment: 0 % or 4 mA
•
Max. adjustment: 100 % or 20 mA
6.3 Application example
•
An upright cylindrical (linear) tank has a volume of 2700 l
•
The max. filling volume is 2650 l, the min. filling volume 50 l
•
The level sensor in the vessel is a pressure transmitter (passive),
outputting a standardised 4 … 20 mA signal
•
For further processing, an additional 4 … 20 mA output signal is
required
•
The full and empty adjustment was carried out directly in the sen-
sor. The following values are outputted:
– Max. volume (display max.) 20 mA = 2650 l
– Min. volume (display min.) 4 mA = 50 l
•
Relay 1 should switch on an emptying pump at a level of 90 % and
switch off the pump at a level of 10 %
Current output
0/4 … 20 mA
Simulation
Reset